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Old 11-24-2013, 07:07 AM   #1
yarryman
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Timing Belt Jumped a Tooth

Need advice if I can proceed with getting a reconditioned Head and use the existing Number one piston with gouaches on the top?

Thanks for the advice in advance

I just changed mine as well but didn't have great luck. Before I changed my timing belt it ran great. After I changed the belt it ran good but had a small miss. Prior to taking the old belt off I tried to align the cam and crank at top with both notches. It didn't matter how many rotations I could not get them to both hit at the 12 o clock position. I had all the spark plugs out and could tell the number one piston was not at TDC. When I had the number one piston at TDC both the Cam and Crank shaft where at 5 minutes to the right of 12 o'clock.

So I proceeded to change the belt with the number one piston at TDC and both the crank and cam at 12 o clock. I put the belt on and tried to rotate the engine 2 times but it the piston would hit the valves. Prior to removing the belt I painted the alignment of both the cam and crank. Next I took the belt off again and put it back the way it was prior to me removing. I checked the rotations of the engine and it rotated all the way through 2 rotations. I put everything back together and it ran good but had a couple of misses. I ran it for about two weeks and yesterday when starting my engine I heard a loud knock coming from my engine and it was idling bad. I immediately turned it off and had it towed home.

Next I removed my head and found out that the number one piston was hitting something. It may have been my valve but there are bits and pieces all in the number one cylinder. I believe my belt jumped a tooth and the piston and valve hit each other.



My question would be is if I have the head reconditioned can i still use the engine with the number one piston having cuts divots in the top of the cylinder. The engine still has good compression.

See picture below:


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Old 11-24-2013, 08:38 AM   #2
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IMO you had something in there like a nut small metal piece like the end of a spark plug

if the valve was held open it bends the valve stem and then there will be contact marks matching the piston to the valve

Check your spark plug ends , I suspect the end of that one is missing

check your belt to the old one for the same number of teeth and that the teeth properly seat in the pulleys

Smoothing out the damage in the head will get you by
The valves on that at least just that cylinder should be pulled and inspected , one looks like its chipped but that doesn't look fresh
check the edges of the piston , I have seen them break down to the ring groove
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Old 11-24-2013, 10:43 AM   #3
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SPI engine, looks typical for the dreaded "dropped valve seat" issue.

Look in the "SPI Performance" section for threads detailing similar issues & their repair.

Head recondition/replacement at a minimum.
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Old 11-24-2013, 01:22 PM   #4
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Could changing my timing belt have done that. I just changed it two weeks ago....
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Old 11-24-2013, 04:39 PM   #5
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Quote:
Originally Posted by yarryman View Post
Could changing my timing belt have done that. I just changed it two weeks ago....
If you have an SPI engine wit more then 100k miles I would not do a thing on that engine except oil changes because you are on borrowed time before the valve seats drop and destroy the engine.
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Old 11-24-2013, 05:42 PM   #6
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http://www.focusfanatics.com/forum/a...1&d=1385298226
see the little piece top left of the valve , betting that is steel
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Old 11-24-2013, 07:46 PM   #7
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From the description it sounds like you had an issue B4 you changed the belt, it just got a lot worse later. Actually surprised it "lasted" that long with the existing problem when the belt was changed.

If the only damage to the piston is what's visible, it could be re-used. Buffing the nicks smooth helps.

Of course you'd want to pull it to make SURE that's all the damage, crap shoot otherwise unless you're REAL sure it's OK. If you look through some of the threads from others with the issue in the SPI section, you'll see some of them thought the piston was OK until they pulled it for inspection.

Your call, pulling the pan & that piston isn't that much more work at this point - you don't want to do this job twice.

Luck!
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Old 11-24-2013, 10:32 PM   #8
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I wouldn't waste time putting it back together without verifying the piston not cracked lower down, you're on the line for the amount of damage that does it. May easily have a bent rod as well. Looks like valve seat came apart or what these do. Clean out the intake, pieces from last time will tear engine up again if left in manifold.

Valves are supposed to not hit if belt breaks or timing jumps.

Last edited by amc49; 11-25-2013 at 10:55 AM.
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Old 11-25-2013, 06:53 AM   #9
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Thanks for the reply. I checked the number 1 piston and it needs replaced.
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Old 11-25-2013, 07:08 AM   #10
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Thanks for the reply...what is a b4
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